Jitter measurement using mixed down topology

Details Jitter measurement using mixed down topology Jitter measurement using mixed down topology

2006-04-25

2006-04-25

Patel, Jay K. (Department: 2637)

Pulse or digital communications

Testing

Phase error or phase jitter

C375S371000

Reexamination Certificate

active

07035325

ABSTRACT:
A jitter measurement method using a down-mixing or down-converting topology in a jitter measurement system preserves the jitter UI rather than the jitter seconds. An input serial data stream at a high baud is mixed with a stable local oscillator frequency that is close to that of the high baud. The difference between the high baud and the local oscillator frequency is passed by a filter as a lower rate serial stream. A clock recovery circuit recovers a lower rate clock from the lower rate serial stream, or an amplitude modulation removal stage converts the lower rate serial stream to a lower rate NRZ signal, or the lower rate serial signal is digitized. Jitter measurement is performed by a jitter measurement stage on the lower rate clock, the lower rate NRZ signal, or the digitized lower rate serial signal.

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Roland E. Best, “Phase-Locked Loops—Theory, Design, and Applications”, Second Edition, McGraw-Hill, Inc.

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